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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2013	Oct. 25, 2013
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Trading Symbol	MRC
Entity Registrant Name	MRC GLOBAL INC.
Entity Central Index Key	0001439095
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		101,753,498

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash	$ 33,439	$ 37,090
Accounts receivable, net	841,545	823,236
Inventories, net	929,529	970,228
Other current assets	31,954	20,020
Total current assets	1,836,467	1,850,574
Other assets	33,357	37,031
Property, plant and equipment, net	118,445	122,458
Intangible assets:
Goodwill, net	623,714	610,392
Other intangible assets, net	711,574	749,272
Total assets	3,323,557	3,369,727
Current liabilities:
Trade accounts payable	498,797	438,344
Accrued expenses and other current liabilities	121,874	125,599
Deferred income taxes	82,813	79,661
Current portion of long term debt	6,500	6,500
Total current liabilities	709,984	650,104
Long-term obligations:
Long-term debt, net	1,037,264	1,250,089
Deferred income taxes	241,090	261,448
Other liabilities	18,659	22,164
Commitments and contingencies
Stockholders' equity:
Common stock, $0.01 par value per share: 500,000 shares authorized, 101,745 and 101,563 issued and outstanding, respectively	1,017	1,016
Preferred stock, $0.01 par value per share; 100,000 shares authorized, no shares issued and outstanding
Additional paid-in capital	1,637,003	1,625,900
Retained deficit	(290,038)	(418,830)
Accumulated other comprehensive loss	(31,422)	(22,164)
Total stockholders' equity	1,316,560	1,185,922
Total liabilities and stockholders' equity	$ 3,323,557	$ 3,369,727

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2013	Dec. 31, 2012
Condensed Consolidated Balance Sheets [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	101,745,000	101,563,000
Common stock, shares outstanding	101,745,000	101,563,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Consolidated Statements of Income [Abstract]
Sales	$ 1,313,711	$ 1,451,114	$ 3,886,589	$ 4,264,125
Cost of sales	1,075,418	1,173,916	3,157,792	3,508,686
Gross profit	238,293	277,198	728,797	755,439
Selling, general and administrative expenses	160,910	154,955	475,642	452,528
Operating income	77,383	122,243	253,155	302,911
Other income (expense):
Interest expense	(15,463)	(28,177)	(45,988)	(92,621)
Loss on early extinguishment of debt		(10,322)		(21,746)
Write off of debt issuance costs				(1,685)
Change in fair value of derivative instruments	(1,828)	845	589	1,770
Other, net	(87)	1,232	(13,471)	3,554
Income before income taxes	60,005	85,821	194,285	192,183
Income tax expense	21,248	30,280	65,493	67,783
Net income	$ 38,757	$ 55,541	$ 128,792	$ 124,400
Basic earnings per common share	$ 0.38	$ 0.55	$ 1.27	$ 1.31
Diluted earnings per common share	$ 0.38	$ 0.54	$ 1.26	$ 1.31
Weighted-average common shares, basic	101,715	101,490	101,673	94,768
Weighted-average common shares, diluted	102,393	102,029	102,455	95,185

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 38,757	$ 55,541	$ 128,792	$ 124,400
Other comprehensive income (loss) before tax - Foreign currency translation adjustments
Foreign currency translation adjustments	12,550	13,049	(9,944)	3,549
Income tax benefit (expense) related to components of other comprehensive income	(437)	(898)	686	(654)
Total other comprehensive (income) loss, net of tax	12,113	12,151	(9,258)	2,895
Comprehensive income	$ 50,870	$ 67,692	$ 119,534	$ 127,295

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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- Definition

Before tax and net of reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation.

+ References + Details

- Definition

Tax effect of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.

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+ Details

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating activities
Net income	$ 128,792	$ 124,400
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	16,782	13,180
Amortization of intangibles	39,128	37,184
Equity-based compensation expense	8,602	5,859
Deferred income tax benefit	(16,747)	(3,463)
Amortization of debt issuance costs	4,376	7,088
Write off of debt issuance costs		1,685
Loss on early extinguishment of debt		21,746
(Decrease) increase in LIFO reserve	(21,247)	3,080
Change in fair value of derivative instruments	(589)	(1,770)
Provision for uncollectible accounts	(355)	3,936
Foreign currency losses	11,993	(520)
Other non-cash items	(133)	5,738
Changes in operating assets and liabilities:
Accounts receivable	(25,448)	(105,234)
Inventories	48,026	(78,889)
Income taxes payable	(815)	5,867
Other current assets	(11,961)	(5,836)
Accounts payable	64,849	9,562
Accrued expenses and other current liabilities	(3,878)	22,154
Net cash provided by operations	241,375	65,767
Investing activities
Purchases of property, plant and equipment	(14,902)	(21,002)
Proceeds from the disposition of property, plant and equipment	4,025	2,451
Acquisitions, net of cash acquired	(21,909)	(89,893)
Other investment and notes receivable transactions	(2,116)	(3,979)
Net cash used in investing activities	(34,902)	(112,423)
Financing activities
Proceeds from the sale of common stock		333,342
Payments on revolving credit facilities	(1,534,095)	(1,801,675)
Proceeds from revolving credit facilities	1,328,296	1,755,456
Purchase of senior secured notes		(205,003)
Payments on long term obligations	(4,875)	(31,456)
Debt issuance costs paid	(189)	(7,930)
Proceeds from exercise of stock options	2,230	51
Tax benefit on stock options	302	422
Other financing activities	(6)
Net cash (used in) provided by financing activities	(208,337)	43,207
Decrease in cash	(1,864)	(3,449)
Effect of foreign exchange rate on cash	(1,787)	(5,839)
Cash - beginning of period	37,090	46,127
Cash - end of period	33,439	36,839
Supplemental disclosures of cash flow information:
Cash paid for interest	41,566	64,368
Cash paid for income taxes	$ 82,589	$ 66,190

Background and Basis of Presentation	9 Months Ended
Background and Basis of Presentation	Sep. 30, 2013
Background and Basis of Presentation [Abstract]
Background and Basis of Presentation	NOTE 1 – BACKGROUND AND BASIS OF PRESENTATION Business Operations: MRC Global Inc. is a holding company headquartered in Houston, Texas. Our wholly owned subsidiaries, McJunkin Red Man Corporation and its subsidiaries, are global distributors of pipe, valves, fittings (“PVF”) and related products and services to the energy and industrial sectors, across each of the upstream (exploration, production and extraction of underground oil and gas), midstream (gathering and transmission of oil and gas, gas utilities and the storage and distribution of oil and gas) and downstream (crude oil refining, petrochemical processing and general industrials) sectors. We have branches in principal industrial, hydrocarbon producing and refining areas throughout the United States, Canada, Europe, Asia and Australasia. Our products are obtained from a broad range of suppliers. Basis of Presentation: We have prepared our unaudited condensed consolidated financial statements in accordance with Rule 10-01 of Regulation S-X for interim financial statements. These statements do not include all information and footnotes that generally accepted accounting principles require for complete annual financial statements. However, the information in these statements reflects all normal recurring adjustments which are, in our opinion, necessary for a fair presentation of the results for the interim periods. The results of operations for the three and nine months ended September 30, 2013 are not necessarily indicative of the results that will be realized for the fiscal year ending December 31, 2013. We have derived our condensed consolidated balance sheet as of December 31, 2012 from the audited consolidated financial statements for the year ended December 31, 2012. You should read these condensed consolidated financial statements in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2012. The consolidated financial statements include the accounts of MRC Global Inc. and its wholly owned and majority owned subsidiaries (collectively referred to as the “Company” or by such terms as “we,” “our” or “us”). All material intercompany balances and transactions have been eliminated in consolidation. Recently Issued Accounting Standards: In February 2013, the Financial Accounting Standards Board (“FASB”) issued Standards Update No. 2013-05, Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (ASU 2013-05), which specifies that a cumulative translation adjustment (“CTA”) should be released into earnings when an entity ceases to have a controlling financial interest in a subsidiary or group of assets within a consolidated foreign entity and the sale or transfer results in the complete or substantially complete liquidation of the foreign entity. For sales of an equity method investment that is a foreign entity, a pro rata portion of CTA attributable to the investment would be recognized in earnings upon sale of the investment. When an entity sells either a part or all of its investment in a consolidated foreign entity, CTA would be recognized in earnings only if the sale results in the parent no longer having a controlling financial interest in the foreign entity. CTA would be recognized in earnings in a business combination achieved in stages. ASU 2013-05 will be effective for us prospectively in 2014. We do not expect this update to have a material impact on our financial statements. In July 2013, the FASB issued Standards Update No. 2013-11, Income Taxes (Topic 740), Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The objective of this update is to eliminate the diversity in practice in the presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. Under this guidance, an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward, except in certain circumstances. This update does not require any new disclosures and is effective for annual and interim periods beginning after December 31, 2013. The amendments in this update will be applied prospectively to all unrecognized tax benefits that exist at the effective date. We do not expect this update to have a material impact on our financial statements.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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+ Details

Acquisition	9 Months Ended
Acquisition	Sep. 30, 2013
Acquisition [Abstract]
Acquisition	NOTE 2 – ACQUISITiON On July 1, 2013, we completed the acquisition of Dan H. Brown Inc., d/b/a Flow Control Products (“Flow Control”). Flow Control is a leading provider in pneumatic and electro-hydraulic valve automation packages and related field support to the Permian Basin. The total purchase price was $24 million subject to customary holdback amounts and working capital adjustments. Pro forma financial information has not been provided as this acquisition is not material to our consolidated financial statements.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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-Publisher FASB
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-Number 88-16
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+ Details

Inventories

9 Months Ended

Sep. 30, 2013

Inventories [Abstract]

Inventories

NOTE 3 – INVENTORIES

The composition of our inventory is as follows (in thousands):


	September 30,	December 31,
	2013	2012
Finished goods inventory at average cost:
Energy carbon steel tubular products	$ 361,925	$ 387,609
Valves, fittings, flanges and all other products	718,854	752,630
	1,080,779	1,140,239
Less: Excess of average cost over LIFO cost (LIFO reserve)	(129,735)	(150,982)
Less: Other inventory reserves	(21,515)	(19,029)
	$ 929,529	$ 970,228

Long-Term Debt

9 Months Ended

Sep. 30, 2013

Long-Term Debt [Abstract]

Long-Term Debt

NOTE 4 – LONG-TERM DEBT

The components of our long-term debt are as follows (in thousands):


	September 30,	December 31,
	2013	2012
Senior Secured Term Loan B, net of discount of $5,649 and $6,345	$ 637,851	$ 642,030
Global ABL Facility	405,732	608,006
Other	181	6,553
	1,043,764	1,256,589
Less current portion	6,500	6,500
	$ 1,037,264	$ 1,250,089

Senior Secured Term Loan B: We have a $650 million seven-year Senior Secured Term Loan B (the “Term Loan”) which amortizes in equal quarterly installments of 1% per year with the balance payable in November 2019 when the facility matures. Subject to securing additional lender commitments, the Term Loan allows for incremental increases in facility size above $650 million up to an aggregate of $200 million, plus an additional amount such that the Company’s senior secured leverage ratio (as defined under the Term Loan) would not exceed 3.50 to 1.00. This facility is guaranteed by us as well as all of our wholly owned U.S. subsidiaries. In addition, it is secured by a second lien on those assets securing our Global ABL Facility (which includes accounts receivable, inventory and related assets) and a first lien on substantially all of our other assets and those of our U.S. subsidiaries, as well as a pledge of all of the capital stock of our domestic subsidiaries and 65% of the capital stock of first tier, non-U.S. subsidiaries. We are required to repay the Term Loan with certain asset sales and insurance proceeds, certain debt proceeds and 50% of excess cash flow (reducing to 25% if our senior secured leverage ratio is no more than 2.75 to 1.00 and 0% if our senior secured leverage ratio is no more than 2.50 to 1.00). In addition, the Term Loan contains a number of customary restrictive covenants.

The interest rate for the Term Loan, including the amortization of original issue discount, was 6.14% and 6.39% as of September 30, 2013 and December 31, 2012, respectively.

Global ABL Facility: We have a $1.25 billion multi-currency global asset-based revolving credit facility (the “Global ABL Facility”) that matures in March 2017. This facility is comprised of $977 million in revolver commitments in the United States, $170 million in Canada, $12 million in the United Kingdom, $75 million in Australia, $9 million in the Netherlands and $7 million in Belgium. It contains an accordion feature that allows us to increase the principal amount of the facility by up to $300 million, subject to securing additional lender commitments.

We and each of our current and future wholly owned material U.S. subsidiaries guarantee the obligations of our borrower subsidiaries under the Global ABL Facility. Additionally, each of our non-U.S. borrower subsidiaries guarantees the obligations of our other non-U.S. borrower subsidiaries under the Global ABL Facility. Outstanding obligations are generally secured by a first priority security interest in accounts receivable, inventory and related assets.

The interest rate for the Global ABL Facility was 2.10% and 2.21% as of September 30, 2013 and December 31, 2012, respectively. Availability under our Global ABL Facility was $573 million as of September 30, 2013.

Stockholders' Equity

9 Months Ended

Sep. 30, 2013

Stockholders' Equity [Abstract]

Stockholders' Equity

NOTE 5 – STOCKHOLDERS’ EQUITY

Stock Options and Restricted Stock

Our 2011 Omnibus Incentive Plan has 3,250,000 shares reserved for issuance pursuant to the plan. The plan permits the issuance of stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units and other stock-based and cash-based awards. Since the adoption of the 2011 Omnibus Incentive Plan, the Company’s Board of Directors has periodically granted stock options and restricted stock to directors and employees, but no other types of awards have been granted under the plan. Options and stock appreciation rights may not be granted at prices less than their fair market value on the date of the grant, nor for a term exceeding ten years. For employees, vesting generally occurs over a four or five year period on the anniversaries of the date specified in the employees’ respective agreements, subject to accelerated vesting under certain circumstances set forth in the option agreements. Vesting for directors generally occurs in one year. In March 2013, 641,294 stock options and 87,914 shares of restricted stock were issued to employees. In May 2013, 71,878 stock options and 9,413 shares of restricted stock were issued to members of our Board of Directors. During the third quarter of 2013, an additional 13,574 and 1,836 stock options and shares of restricted stock were issued to employees and members of our Board of Directors. To date, 1,891,670 shares have been granted to management, members of our Board of Directors and key employees under this plan. We expense the fair value of the stock option grants on a straight-line basis over the vesting period. A Black-Scholes option-pricing model is used to estimate the fair value of the stock options.

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss in the accompanying consolidated balance sheets consists of the following (in thousands):



	September 30,	December 31,
	2013	2012
Currency translation adjustments	$ (31,087)	$ (21,829)
Pension related adjustments	(335)	(335)
Accumulated other comprehensive loss	$ (31,422)	$ (22,164)

Earnings per Share

Earnings per share are calculated in the table below (in thousands, except per share amounts).



	Three Months Ended		Nine Months Ended
	September 30,	September 30,	September 30,	September 30,
	2013	2012	2013	2012
Net income	$ 38,757	$ 55,541	$ 128,792	$ 124,400

Average basic shares outstanding	101,715	101,490	101,673	94,768
Effect of dilutive securities	678	539	782	417
Average diluted shares outstanding	102,393	102,029	102,455	95,185

Net income per share:
Basic	$ 0.38	$ 0.55	$ 1.27	$ 1.31
Diluted	$ 0.38	$ 0.54	$ 1.26	$ 1.31

Stock options and shares of restricted stock are disregarded in this calculation if they are determined to be anti-dilutive. For the three and nine months ended September 30, 2013, we had approximately 1.2 million and 0.6 million anti-dilutive stock options, respectively. For the three and nine months ended September 30, 2012, we had approximately 1.8 million and 2.3 million anti-dilutive stock options, respectively. There was no anti-dilutive restricted stock for the three and nine months ended September 30, 2013 and 2012.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
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Reference 23: http://www.xbrl.org/2003/role/presentationRef
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-Number 210
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-Article 3

+ Details

Segment Information

9 Months Ended

Sep. 30, 2013

Segment Information [Abstract]

Segment Information

NOTE 6 – SEGMENT INFORMATION

We operate as three business segments, U.S., Canada and International. Our International segment consists of our operations outside of the U.S. and Canada, principally Europe, Asia and Australasia. These segments represent our business of selling PVF and related products and services to the energy and industrial sectors, across each of the upstream (exploration, production and extraction of underground oil and gas), midstream (gathering and transmission of oil and gas, gas utilities, and the storage and distribution of oil and gas) and downstream (crude oil refining, petrochemical processing and general industrials) sectors.

The following table presents financial information for each segment (in millions):


	Three Months Ended		Nine Months Ended
	September 30,	September 30,	September 30,	September 30,
	2013	2012	2013	2012
Sales
U.S.	$ 1,015.0	$ 1,111.9	$ 2,955.8	$ 3,284.2
Canada	162.1	185.6	520.1	553.3
International	136.6	153.6	410.7	426.6
Consolidated	$ 1,313.7	$ 1,451.1	$ 3,886.6	$ 4,264.1

Operating income
U.S.	$ 72.9	$ 108.5	$ 229.8	$ 265.1
Canada	3.2	5.7	14.6	17.5
International	1.3	8.0	8.8	20.3
Consolidated	77.4	122.2	253.2	302.9

Interest expense	(15.5)	(28.2)	(46.0)	(92.6)
Other, net	(1.9)	(8.2)	(12.9)	(18.1)
Income before income taxes	$ 60.0	$ 85.8	$ 194.3	$ 192.2


			September 30,	December 31,
			2013	2012
Total assets
U.S.			$ 2,753.0	$ 2,732.4
Canada			187.9	249.1
International			382.6	388.2
Total assets			$ 3,323.5	$ 3,369.7

Our sales by product line are as follows (in thousands):


	Three Months Ended		Nine Months Ended
	September 30,	September 30,	September 30,	September 30,
Type	2013	2012	2013	2012
Energy carbon steel tubular products:
Line pipe	$ 278,460	$ 294,599	$ 771,230	$ 879,305
Oil country tubular goods (OCTG)	105,500	186,367	345,139	600,955
	$ 383,960	$ 480,966	$ 1,116,369	$ 1,480,260


Valves, fittings, flanges and other products:
Valves and specialty products	$ 355,726	$ 373,512	$ 1,071,205	$ 1,073,435
Carbon steel fittings and flanges and stainless steel and alloy pipe and fittings	286,732	311,162	869,995	887,678
Other	287,293	285,474	829,020	822,752
	$ 929,751	$ 970,148	$ 2,770,220	$ 2,783,865

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2013
Fair Value Measurements [Abstract]
Fair Value Measurements	NOTE 7 – FAIR VALUE MEASUREMENTS From time to time, we use derivative financial instruments to help manage our exposure to interest rate risk and fluctuations in foreign currencies. All of our derivative instruments are freestanding and, accordingly, changes in their fair market value are recorded in earnings. As of September 30, 2013, we do not have any interest rate swap agreements. Foreign exchange forward contracts are reported at fair value utilizing Level 2 inputs, as the fair value is based on broker quotes for the same or similar derivative instruments. The total notional amount of our forward foreign exchange contracts was approximately $48 million and $69 million at September 30, 2013 and December 31, 2012, respectively. We had approximately $0 and $3,000 recorded as assets on our consolidated balance sheets as of September 30, 2013 and December 31, 2012, respectively. With the exception of long-term debt, the fair values of our financial instruments, including cash and cash equivalents, accounts receivable, trade accounts payable and accrued liabilities approximate carrying value. The carrying value of our debt was $1.044 billion and $1.257 billion at September 30, 2013 and December 31, 2012, respectively. We estimate the fair value of the Term Loan using Level 2 inputs, or quoted market prices. The fair value of our debt was $1.051 billion and $1.261 billion at September 30, 2013 and December 31, 2012, respectively.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
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-Name Statement of Financial Accounting Standard (FAS)
-Number 133
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Number 107
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2013
Commitments And Contingencies [Abstract]
Commitments and Contingencies	NOTE 8 – COMMITMENTS AND CONTINGENCIES Litigation Asbestos Claims. We are one of many defendants in lawsuits that plaintiffs have brought seeking damages for personal injuries that exposure to asbestos allegedly caused. Plaintiffs and their family members have brought these lawsuits against a large volume of defendant entities as a result of the defendants’ manufacture, distribution, supply or other involvement with asbestos, asbestos containing-products or equipment or activities that allegedly caused plaintiffs to be exposed to asbestos. These plaintiffs typically assert exposure to asbestos as a consequence of third-party manufactured products that MRC purportedly distributed. As of September 30, 2013, we are named a defendant in approximately 282 lawsuits involving approximately 934 claims. No asbestos lawsuit has resulted in a judgment against us to date, with a majority being settled, dismissed or otherwise resolved. Applicable third-party insurance has substantially covered these claims, and insurance should continue to cover a substantial majority of existing and anticipated future claims. Accordingly, we have recorded a liability for our estimate of the most likely settlement of asserted claims and a related receivable from insurers for our estimated recovery, to the extent we believe that the amounts of recovery are probable. It is not possible to predict the outcome of these claims and proceedings. However, in our opinion, there are no pending legal proceedings that are likely to have a material adverse effect on our consolidated financial statements. Other Legal Claims and Proceedings. From time to time, we have been subject to various claims and involved in legal proceedings incidental to the nature of our businesses. We maintain insurance coverage to reduce financial risk associated with certain of these claims and proceedings. It is not possible to predict the outcome of these claims and proceedings. However, in our opinion, there are no pending legal proceedings that are likely to have a material adverse effect on our consolidated financial statements. Product Claims. From time to time, in the ordinary course of our business, our customers may claim that the products that we distribute are either defective or require repair or replacement under warranties that either we or the manufacturer may provide to the customer. These proceedings are, in the opinion of management, ordinary and routine matters incidental to our normal business. Our purchase orders with our suppliers generally require the manufacturer to indemnify us against any product liability claims, leaving the manufacturer ultimately responsible for these claims. In many cases, state, provincial or foreign law provides protection to distributors for these sorts of claims, shifting the responsibility to the manufacturer. In some cases, we could be required to repair or replace the products for the benefit of our customer and seek our recovery from the manufacturer for our expense. In the opinion of management, the ultimate disposition of these claims and proceedings is not expected to have a material adverse effect on our consolidated financial statements. Customer Contracts We have contracts and agreements with many of our customers that dictate certain terms of our sales arrangements (pricing, deliverables, etc.). While we make every effort to abide by the terms of these contracts, certain provisions are complex and often subject to varying interpretations. Under the terms of these contracts, our customers have the right to audit our adherence to the contract terms. Historically, any settlements that have resulted from these customer audits have not been material to our consolidated financial statements. Purchase Commitments We have purchase obligations consisting primarily of inventory purchases made in the normal course of business to meet operating needs. While our vendors often allow us to cancel these purchase orders without penalty, in certain cases, cancellations may subject us to cancellation fees or penalties depending on the terms of the contract.

- Definition

The entire disclosure for commitments and contingencies.

+ References

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Background and Basis of Presentation (Policy)	9 Months Ended
Background and Basis of Presentation (Policy)	Sep. 30, 2013
Background and Basis of Presentation [Abstract]
Business Operations	Business Operations: MRC Global Inc. is a holding company headquartered in Houston, Texas. Our wholly owned subsidiaries, McJunkin Red Man Corporation and its subsidiaries, are global distributors of pipe, valves, fittings (“PVF”) and related products and services to the energy and industrial sectors, across each of the upstream (exploration, production and extraction of underground oil and gas), midstream (gathering and transmission of oil and gas, gas utilities and the storage and distribution of oil and gas) and downstream (crude oil refining, petrochemical processing and general industrials) sectors. We have branches in principal industrial, hydrocarbon producing and refining areas throughout the United States, Canada, Europe, Asia and Australasia. Our products are obtained from a broad range of suppliers.
Basis of Presentation	Basis of Presentation: We have prepared our unaudited condensed consolidated financial statements in accordance with Rule 10-01 of Regulation S-X for interim financial statements. These statements do not include all information and footnotes that generally accepted accounting principles require for complete annual financial statements. However, the information in these statements reflects all normal recurring adjustments which are, in our opinion, necessary for a fair presentation of the results for the interim periods. The results of operations for the three and nine months ended September 30, 2013 are not necessarily indicative of the results that will be realized for the fiscal year ending December 31, 2013. We have derived our condensed consolidated balance sheet as of December 31, 2012 from the audited consolidated financial statements for the year ended December 31, 2012. You should read these condensed consolidated financial statements in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2012. The consolidated financial statements include the accounts of MRC Global Inc. and its wholly owned and majority owned subsidiaries (collectively referred to as the “Company” or by such terms as “we,” “our” or “us”). All material intercompany balances and transactions have been eliminated in consolidation.
Recently Issued Accounting Standards	Recently Issued Accounting Standards: In February 2013, the Financial Accounting Standards Board (“FASB”) issued Standards Update No. 2013-05, Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (ASU 2013-05), which specifies that a cumulative translation adjustment (“CTA”) should be released into earnings when an entity ceases to have a controlling financial interest in a subsidiary or group of assets within a consolidated foreign entity and the sale or transfer results in the complete or substantially complete liquidation of the foreign entity. For sales of an equity method investment that is a foreign entity, a pro rata portion of CTA attributable to the investment would be recognized in earnings upon sale of the investment. When an entity sells either a part or all of its investment in a consolidated foreign entity, CTA would be recognized in earnings only if the sale results in the parent no longer having a controlling financial interest in the foreign entity. CTA would be recognized in earnings in a business combination achieved in stages. ASU 2013-05 will be effective for us prospectively in 2014. We do not expect this update to have a material impact on our financial statements. In July 2013, the FASB issued Standards Update No. 2013-11, Income Taxes (Topic 740), Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The objective of this update is to eliminate the diversity in practice in the presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. Under this guidance, an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward, except in certain circumstances. This update does not require any new disclosures and is effective for annual and interim periods beginning after December 31, 2013. The amendments in this update will be applied prospectively to all unrecognized tax benefits that exist at the effective date. We do not expect this update to have a material impact on our financial statements.

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Number 210
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-Article 1

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-Name Statement of Financial Accounting Standard (FAS)
-Number 140
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+ Details

Inventories (Tables)

9 Months Ended

Sep. 30, 2013

Inventories [Abstract]

Composition of Inventory


	September 30,	December 31,
	2013	2012
Finished goods inventory at average cost:
Energy carbon steel tubular products	$ 361,925	$ 387,609
Valves, fittings, flanges and all other products	718,854	752,630
	1,080,779	1,140,239
Less: Excess of average cost over LIFO cost (LIFO reserve)	(129,735)	(150,982)
Less: Other inventory reserves	(21,515)	(19,029)
	$ 929,529	$ 970,228

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2013

Long-Term Debt [Abstract]

Components of Long-Term Debt


	September 30,	December 31,
	2013	2012
Senior Secured Term Loan B, net of discount of $5,649 and $6,345	$ 637,851	$ 642,030
Global ABL Facility	405,732	608,006
Other	181	6,553
	1,043,764	1,256,589
Less current portion	6,500	6,500
	$ 1,037,264	$ 1,250,089

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2013

Stockholders' Equity [Abstract]

Accumulated Other Comprehensive Loss in Accompanying Consolidated Balance Sheets



	September 30,	December 31,
	2013	2012
Currency translation adjustments	$ (31,087)	$ (21,829)
Pension related adjustments	(335)	(335)
Accumulated other comprehensive loss	$ (31,422)	$ (22,164)

Earnings Per Share



	Three Months Ended		Nine Months Ended
	September 30,	September 30,	September 30,	September 30,
	2013	2012	2013	2012
Net income	$ 38,757	$ 55,541	$ 128,792	$ 124,400

Average basic shares outstanding	101,715	101,490	101,673	94,768
Effect of dilutive securities	678	539	782	417
Average diluted shares outstanding	102,393	102,029	102,455	95,185

Net income per share:
Basic	$ 0.38	$ 0.55	$ 1.27	$ 1.31
Diluted	$ 0.38	$ 0.54	$ 1.26	$ 1.31

Segment Information (Tables)

9 Months Ended

Sep. 30, 2013

Segment Information [Abstract]

Schedule of Financial Information for Each Segment


	Three Months Ended		Nine Months Ended
	September 30,	September 30,	September 30,	September 30,
	2013	2012	2013	2012
Sales
U.S.	$ 1,015.0	$ 1,111.9	$ 2,955.8	$ 3,284.2
Canada	162.1	185.6	520.1	553.3
International	136.6	153.6	410.7	426.6
Consolidated	$ 1,313.7	$ 1,451.1	$ 3,886.6	$ 4,264.1

Operating income
U.S.	$ 72.9	$ 108.5	$ 229.8	$ 265.1
Canada	3.2	5.7	14.6	17.5
International	1.3	8.0	8.8	20.3
Consolidated	77.4	122.2	253.2	302.9

Interest expense	(15.5)	(28.2)	(46.0)	(92.6)
Other, net	(1.9)	(8.2)	(12.9)	(18.1)
Income before income taxes	$ 60.0	$ 85.8	$ 194.3	$ 192.2


			September 30,	December 31,
			2013	2012
Total assets
U.S.			$ 2,753.0	$ 2,732.4
Canada			187.9	249.1
International			382.6	388.2
Total assets			$ 3,323.5	$ 3,369.7

Schedule of Net Sales by Product Line


	Three Months Ended		Nine Months Ended
	September 30,	September 30,	September 30,	September 30,
Type	2013	2012	2013	2012
Energy carbon steel tubular products:
Line pipe	$ 278,460	$ 294,599	$ 771,230	$ 879,305
Oil country tubular goods (OCTG)	105,500	186,367	345,139	600,955
	$ 383,960	$ 480,966	$ 1,116,369	$ 1,480,260


Valves, fittings, flanges and other products:
Valves and specialty products	$ 355,726	$ 373,512	$ 1,071,205	$ 1,073,435
Carbon steel fittings and flanges and stainless steel and alloy pipe and fittings	286,732	311,162	869,995	887,678
Other	287,293	285,474	829,020	822,752
	$ 929,751	$ 970,148	$ 2,770,220	$ 2,783,865

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Acquisition (Details) $ in Millions	Jul. 02, 2013 USD ($)
Acquisition [Abstract]
Acquisition of Flow Control	$ 24

Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Finished goods inventory at average cost:
Finished goods inventory at average cost	$ 1,080,779	$ 1,140,239
Less: Excess of average cost over LIFO cost (LIFO reserve)	(129,735)	(150,982)
Less: Other inventory reserves	(21,515)	(19,029)
Inventories, net	929,529	970,228
Energy carbon steel tubular products [Member]
Finished goods inventory at average cost:
Finished goods inventory at average cost	361,925	387,609
Valves, fittings, flanges and all other products [Member]
Finished goods inventory at average cost:
Finished goods inventory at average cost	$ 718,854	$ 752,630

- Definition

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.BB)
-URI http://asc.fasb.org/extlink&oid=6386940&loc=d3e100047-122729

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 8, 9, 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 9
-Chapter 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5

+ Details

Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Revolving credit facility [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Mar. 31, 2017
Credit facility, maximum borrowing capacity	$ 1,250
Global ABL accordian feature	300
Revolving credit facility [Member] \| U.S. [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	977
Revolving credit facility [Member] \| Canada [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	170
Revolving credit facility [Member] \| United Kingdom [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	12
Revolving credit facility [Member] \| Australia [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	75
Revolving credit facility [Member] \| Netherlands [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	9
Revolving credit facility [Member] \| Belgium [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 7
Global ABL Facility [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	2.10%	2.21%
Credit facility, remaining borrowing capacity	$ 573
Senior Secured Term Loan B [Member]
Debt Instrument [Line Items]
New Term Loan	$ 650
Debt maturity period	7 years
Term loan annual amortization percentage	1.00%
Debt instrument, maturity date	Nov. 30, 2019
Term Loan accordion feature	$ 200
Percentage of capital stock in foreign subsidiaries securing Term Loan B	65.00%
Debt instrument, interest rate	6.14%	6.39%
Senior Secured Term Loan B [Member] \| Senior Secured Leverage Ratio Is No More Than 2.75 to 1.00 [Member]
Debt Instrument [Line Items]
Senior secured leverage ratio	2.75
Repayment of Term Loan, percentage	25.00%
Senior Secured Term Loan B [Member] \| Senior Secured Leverage Ratio Is No More Than 2.50 to 1.00 [Member]
Debt Instrument [Line Items]
Senior secured leverage ratio	2.50
Repayment of Term Loan, percentage	0.00%
Senior Secured Term Loan B [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Senior secured leverage ratio	3.50
Repayment of Term Loan, percentage	50.00%

Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 1,043,764	$ 1,256,589
Less current portion	6,500	6,500
Long-term debt, net	1,037,264	1,250,089
Senior secured term loan [Member]
Debt Instrument [Line Items]
Long-term debt	637,851	642,030
Original issue discount on senior secured Term Loan B	5,649	6,345
Global ABL Facility [Member]
Debt Instrument [Line Items]
Long-term debt	405,732	608,006
Other [Member]
Debt Instrument [Line Items]
Long-term debt	$ 181	$ 6,553

Stockholders' Equity (Narrative) (Details) - shares	1 Months Ended		3 Months Ended		9 Months Ended
Stockholders' Equity (Narrative) (Details) - shares	May 31, 2013	Mar. 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Options [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Anti-dilutive securities			1,200,000	1,800,000	600,000	2,300,000
Restricted Stock [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Anti-dilutive securities			0	0	0	0
2011 Omnibus Incentive Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Shares reserved for Incentive Plan			3,250,000		3,250,000
Stock options issued or granted					1,891,670
2011 Omnibus Incentive Plan [Member] \| Director [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Vesting period					1 year
2011 Omnibus Incentive Plan [Member] \| Stock Options [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Maximum term for stock option plan grant					10 years
Stock options issued or granted		641,294	13,574
2011 Omnibus Incentive Plan [Member] \| Stock Options [Member] \| Director [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Stock options issued or granted	71,878
2011 Omnibus Incentive Plan [Member] \| Restricted Stock [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock issued		87,914	1,836
2011 Omnibus Incentive Plan [Member] \| Restricted Stock [Member] \| Director [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock issued	9,413
2011 Omnibus Incentive Plan [Member] \| Minimum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Vesting period					4 years
2011 Omnibus Incentive Plan [Member] \| Maximum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Vesting period					5 years

Stockholders' Equity (Accumulated Other Comprehensive Loss in Accompanying Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Stockholders' Equity [Abstract]
Currency translation adjustments	$ (31,087)	$ (21,829)
Pension related adjustments	(335)	(335)
Accumulated other comprehensive loss	$ (31,422)	$ (22,164)

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (j-k)
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 14
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-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 12, 13
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 133
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 31
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 18, 19, 22, 23, 24, 25, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Stockholders' Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stockholders' Equity [Abstract]
Net income	$ 38,757	$ 55,541	$ 128,792	$ 124,400
Average basic shares outstanding	101,715	101,490	101,673	94,768
Effect of dilutive securities	678	539	782	417
Average diluted shares outstanding	102,393	102,029	102,455	95,185
Net income per share:
Basic	$ 0.38	$ 0.55	$ 1.27	$ 1.31
Diluted	$ 0.38	$ 0.54	$ 1.26	$ 1.31

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher SEC
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-Number 210
-Section 03
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment Information (Narrative) (Details)	9 Months Ended
Segment Information (Narrative) (Details)	Sep. 30, 2013 segment
Segment Information [Abstract]
Number of operating segments	3

Segment Information (Schedule of Financial Information for Each Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Sales
Consolidated revenues	$ 1,313,711	$ 1,451,114	$ 3,886,589	$ 4,264,125
Operating income
Total operating income	77,383	122,243	253,155	302,911
Interest expense	(15,463)	(28,177)	(45,988)	(92,621)
Other, net	(1,900)	(8,200)	(12,900)	(18,100)
Income before income taxes	60,005	85,821	194,285	192,183
Total assets
Total assets	3,323,557		3,323,557		$ 3,369,727
U.S. [Member]
Sales
Consolidated revenues	1,015,000	1,111,900	2,955,800	3,284,200
Operating income
Total operating income	72,900	108,500	229,800	265,100
Total assets
Total assets	2,753,000		2,753,000		2,732,400
Canada [Member]
Sales
Consolidated revenues	162,100	185,600	520,100	553,300
Operating income
Total operating income	3,200	5,700	14,600	17,500
Total assets
Total assets	187,900		187,900		249,100
International [Member]
Sales
Consolidated revenues	136,600	153,600	410,700	426,600
Operating income
Total operating income	1,300	$ 8,000	8,800	$ 20,300
Total assets
Total assets	$ 382,600		$ 382,600		$ 388,200

Segment Information (Schedule of Net Sales by Product Line) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Energy carbon steel tubular products [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 383,960,000	$ 480,966,000	$ 1,116,369,000	$ 1,480,260,000
Energy carbon steel tubular products [Member] \| Line pipe [Member]
Segment Reporting Information [Line Items]
Net Sales	278,460,000	294,599,000	771,230,000	879,305,000
Energy carbon steel tubular products [Member] \| Oil country tubular goods (OCTG) [Member]
Segment Reporting Information [Line Items]
Net Sales	105,500,000	186,367,000	345,139,000	600,955,000
Valves, fittings, flanges and all other products [Member]
Segment Reporting Information [Line Items]
Net Sales	929,751,000	970,148,000	2,770,220,000	2,783,865,000
Valves, fittings, flanges and all other products [Member] \| Valves and Specialty Products [Member]
Segment Reporting Information [Line Items]
Net Sales	355,726,000	373,512,000	1,071,205,000	1,073,435,000
Valves, fittings, flanges and all other products [Member] \| Carbon steel fittings and flanges and stainless steel and alloy pipe and fittings [Member]
Segment Reporting Information [Line Items]
Net Sales	286,732,000	311,162,000	869,995,000	887,678,000
Valves, fittings, flanges and all other products [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 287,293,000	$ 285,474,000	$ 829,020,000	$ 822,752,000

Fair Value Measurements (Details) - USD ($)	Sep. 30, 2013	Dec. 31, 2012
Long-term Debt [Member]
Fair Value Disclosures [Line Items]
Carrying value of debt	$ 1,044,000,000	$ 1,257,000,000
Long-term Debt [Member] \| Level 2 [Member]
Fair Value Disclosures [Line Items]
Fair value of our debt	1,051,000,000	1,261,000,000
Foreign exchange forward contracts [Member]
Fair Value Disclosures [Line Items]
Notional amount of forward foreign exchange contracts	48,000,000	69,000,000
Foreign exchange forward contracts [Member] \| Level 2 [Member]
Fair Value Disclosures [Line Items]
Fair value of forward foreign exchange contracts	$ 0	$ 3,000

Commitments and Contingencies (Details)	9 Months Ended
Commitments and Contingencies (Details)	Sep. 30, 2013 claim lawsuit
Commitments And Contingencies [Abstract]
Number of lawsuits \| lawsuit	282
Asbestos related pending claims \| claim	934